66290325230021 has 4 divisors (see below), whose sum is σ = 66298104880044. Its totient is φ = 66282545580000.

The previous prime is 66290325229993. The next prime is 66290325230027. The reversal of 66290325230021 is 12003252309266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22933697299396 + 43356627930625 = 4788914^2 + 6584575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66290325230021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66290325230027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3889812230 + ... + 3889829271.

It is an arithmetic number, because the mean of its divisors is an integer number (16574526220011).

Almost surely, 2^{66290325230021} is an apocalyptic number.

It is an amenable number.

66290325230021 is a deficient number, since it is larger than the sum of its proper divisors (7779650023).

66290325230021 is an equidigital number, since it uses as much as digits as its factorization.

66290325230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7779650022.

The product of its (nonzero) digits is 233280, while the sum is 41.

Adding to 66290325230021 its reverse (12003252309266), we get a palindrome (78293577539287).

The spelling of 66290325230021 in words is "sixty-six trillion, two hundred ninety billion, three hundred twenty-five million, two hundred thirty thousand, twenty-one".